2025 GMC Sierra 3500HD SLT Dually 4x4 | Duramax Diesel | Allison 10-Speed | Long Box
Built for the toughest jobs and the biggest trailers, this 2025 GMC Sierra 3500HD SLT Crew Cab DRW 4x4 Long Box combines premium comfort with exceptional heavy-duty capability. Finished in sophisticated Sterling Metallic with a luxurious Jet Black perforated leather interior, this Sierra is powered by the legendary 6.6L Duramax Turbo-Diesel V8 paired with the renowned Allison 10-Speed Automatic Transmission.
Whether you're hauling equipment, towing a fifth wheel, or running a business, this truck is built to perform.
Key Features
6.6L Duramax Turbo-Diesel V8 (L5P) Industry-leading diesel performance delivering exceptional torque, towing capability, and long-term durability.
Allison 10-Speed Automatic Transmission (MGM) Smooth, intelligent shifting designed for maximum towing confidence and efficiency.
Dual Rear Wheel (DRW) Configuration (DZW) Enhanced stability and towing performance for large RVs, equipment trailers, and commercial applications.
14,000 lb GVWR Package (G9Y) Built to handle serious payload and towing demands.
4-Wheel Drive (4WD) Confident traction for Alberta winters, muddy job sites, and challenging road conditions.
Premium Towing & Trailering Features
Gooseneck / 5th Wheel Prep Package (Z6A) Factory-installed towing prep for heavy-duty towing applications.
HD Surround Vision (UV2) Multiple camera views make maneuvering and towing easier than ever.
Bed View Camera (UVN) Provides a clear view of cargo and fifth-wheel/gooseneck connections.
High Idle Switch (UF3) Ideal for commercial use and cold-weather operation.
SLT Luxury & Technology
SLT Convenience Package (PCY) Adds premium comfort and convenience features.
SLT Preferred Package (PDY) Enhanced luxury and technology upgrades.
Sierra HD Pro Safety Plus Package (PED) Advanced safety and driver-assistance technologies for added confidence on the road.
Bose Premium 7-Speaker Audio System (UQA) Exceptional sound quality for long highway drives.
Perforated Leather-Appointed Front Seats (H1Y) Premium Jet Black leather seating surfaces designed for comfort and refinement.
Additional Features
Spray-On Bedliner (CGN) Durable factory-installed protection for your truck bed.
Skid Plates (NZZ) Added underbody protection for rough terrain and job sites.
Exterior: Sterling Metallic (GXD) A premium metallic finish that looks professional while standing out from the crowd.
Crew Cab Long Box Configuration Maximum passenger space combined with exceptional cargo and towing versatility.
Why Buy This Sierra 3500HD SLT?
The 2025 GMC Sierra 3500HD SLT Duramax Dually is the ideal truck for owners who need serious towing capability without sacrificing comfort. Loaded with advanced camera technology, premium leather seating, Bose audio, and factory fifth-wheel prep, this truck is ready for work, recreation, or life on the road.
Perfect For
RV owners • Farmers • Ranchers • Contractors • Hotshot operators • Commercial fleets • Heavy towing enthusiasts
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AM/FM Stereo
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Auxiliary Audio Input
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Bluetooth Connection
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MP3 Player
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Navigation System
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Smart Device Integration
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Requires Subscription
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Satellite Radio
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Audio system feature, 6-speaker system
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WiFi Hotspot
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Aluminum Wheels
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Tires - Front All-Terrain
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Tires - Rear All-Terrain
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Conventional Spare Tire
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Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
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Bumper, front chrome lower
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Bumper, rear chrome with bumper CornerSteps
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Bed Step, Black integrated on forward portion of bed on driver and passenger side
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Mouldings, beltline, stainless steel
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Wheelhouse liners, rear (Not available with dual rear wheel models.)
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Grille, Chrome surround with chrome insert bars
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Daytime Running Lights
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LED Headlights
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Automatic Highbeams
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Fog Lamps
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Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
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LED Cargo Area Lighting located in cargo bed activated with switch on centre switch bank or key fob
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Heated Mirrors
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Integrated Turn Signal Mirrors
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Power Folding Mirrors
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Power Mirror(s)
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Mirror caps, chrome
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Intermittent Wipers
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Rain Sensing Wipers
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Variable Speed Intermittent Wipers
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Privacy Glass
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Integrated Tailgate Step
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Tailgate and bed rail protection caps, top
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Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
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Split Bench Seat
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Leather Seats
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Driver Adjustable Lumbar
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Power Driver Seat
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Passenger Adjustable Lumbar
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Power Passenger Seat
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Pass-Through Rear Seat
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Rear Bench Seat
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Heated Front Seat(s)
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Mirror Memory
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Seat Memory
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Floor Mats
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Steering wheel, wrapped
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Heated Steering Wheel
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Adjustable Steering Wheel
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Steering Wheel Audio Controls
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Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
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GMC Premium information Display- 13.4" diagonal Multicolour touch screen
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Exterior Temperature Display located in radio display
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Compass, located in instrument cluster
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Tire Pressure Monitor
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Window, power front, drivers express up/down
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Power Windows
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Power Door Locks
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Remote Engine Start
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Keyless Entry
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Keyless Start
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Cruise Control
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Security System
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Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
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Auxiliary Audio Input
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MP3 Player
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USB ports, (2) charge-only, rear
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Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
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A/C
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Climate Control
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Multi-Zone A/C
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Rear Defrost
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Auto-Dimming Rearview Mirror
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Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted
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8 Cylinder Engine
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Gasoline Fuel
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10-Speed A/T
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A/T
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Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
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Running Boards/Side Steps
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Keyless Start
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Air filter, heavy-duty
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Air filtration monitoring
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Transfer case, two-speed active electronic Autotrac with push button control (Requires 4WD models.)
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Locking/Limited Slip Differential
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Four Wheel Drive
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Cooling, external engine oil cooler
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Cooling, auxiliary external transmission oil cooler
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Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.)
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Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
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Tow Hooks
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Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
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Suspension Package (Not available with (X31) Off-Road Package.)
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Power Steering
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4-Wheel Disc Brakes
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ABS
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Brake lining wear indicator
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Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
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Automatic Highbeams
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Front Collision Mitigation
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Front Collision Warning
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Lane Departure Warning
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Tow Hitch
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ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App
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Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
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Front Collision Mitigation
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Front Collision Warning
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Stability Control
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Traction Control
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Daytime Running Lights
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Driver Air Bag
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Front Head Air Bag
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Front Side Air Bag
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Passenger Air Bag
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Passenger Air Bag Sensor
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Rear Head Air Bag
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Requires Subscription
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Telematics
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Back-Up Camera
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Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
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Lane Departure Warning
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Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
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Rear Seat Reminder
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Driver Restriction Features
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Seat Belt Adjustable Guide Loops, front row only
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Rear Seat Belt Indicator (Requires Crew Cab or Double Cab model.)
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Buckle to Drive prevents vehicle from being shifted out of Park until driver seat belt is fastened; times out after 20 seconds and encourages seat belt use (Included and only available with (PDI) Sierra HD Pro Safety)
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Tire Pressure Monitor
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Vehicle NameGMC Sierra 3500HD
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Body StyleCrew Cab Pickup
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Body CodeE63
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DrivetrainFour Wheel Drive
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Trans Order CodeMGM
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Trans Type10
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Trans Description Cont.Automatic
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First Gear Ratio (:1)4.54
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Second Gear Ratio (:1)2.87
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Third Gear Ratio (:1)2.06
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Fourth Gear Ratio (:1)1.72
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Fifth Gear Ratio (:1)1.48
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Sixth Gear Ratio (:1)1.26
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Seventh Gear Ratio (:1)1.00
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Eighth Gear Ratio (:1)0.85
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Ninth Gear Ratio (:1)0.69
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Tenth Gear Ratio (:1)0.63
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Reverse Ratio (:1)4.54
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Passenger Capacity6
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Front Head Room (in)43.03
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Front Leg Room (in)44.53
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Front Shoulder Room (in)66.02
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Front Hip Room (in)61.18
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Second Head Room (in)40.12
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Second Leg Room (in)43.4
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Second Shoulder Room (in)65.3
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Second Hip Room (in)60.24
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Gross Axle Wt Rating - Front (lbs)5600
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Gross Axle Wt Rating - Rear (lbs)10400
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Curb Weight - Front (lbs)4209
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Curb Weight - Rear (lbs)2870
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Gross Vehicle Weight Rating Cap (lbs)14000
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Gross Combined Wt Rating (lbs)40000
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Dead Weight Hitch - Max Trailer Wt. (lbs)5000
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Dead Weight Hitch - Max Tongue Wt. (lbs)500
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Wt Distributing Hitch - Max Trailer Wt. (lbs)20000
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Wt Distributing Hitch - Max Tongue Wt. (lbs)2000
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)31440
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)7860
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Maximum Trailering Capacity (lbs)20000
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Engine Order CodeL5P
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Engine TypeTurbocharged Diesel V8
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Displacement6.6L
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Fuel SystemDirect Injection
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SAE Net Horsepower @ RPM470 @ 2800
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SAE Net Torque @ RPM975 @ 1600
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Engine Oil CoolerYes
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Cold Cranking Amps @ 0° F (Primary)720
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Maximum Alternator Capacity (amps)170
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Frame TypeHydroformed
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Suspension Type - FrontShort/Long Arm w/Torsion Bars
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Suspension Type - Rear3-Stage Multi-Leaf
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Axle Type - FrontIndependent
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Axle Ratio (:1) - Front3.73
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Axle Ratio (:1) - Rear3.73
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Shock Absorber Diameter - Front (mm)51
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Shock Absorber Diameter - Rear (mm)51
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Stabilizer Bar Diameter - Front (in)1.38
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Front Tire Order CodeQF6
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Rear Tire Order CodeQF6
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Spare Tire Order CodeZYG
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Front Tire SizeLT275/70R18
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Rear Tire SizeLT275/70R18
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Spare Tire SizeLT275/70R18
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Front Wheel Size (in)18 x 8
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Rear Wheel Size (in)18 x 8
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Spare Wheel Size (in)18 x 8
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Front Wheel MaterialAluminum
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Rear Wheel MaterialAluminum
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Spare Wheel MaterialSteel
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Steering TypePwr Recirculating Ball
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Steering Ratio (:1), At LockN/A
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Turning Diameter - Curb to Curb (ft)57.0
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Turning Diameter - Wall to Wall (ft)N/A
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Brake TypePwr
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Brake ABS System4-Wheel
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Disc - FrontYes
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Disc - RearYes
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Front Brake Rotor Diam x Thickness (in)14 x 1.6
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Rear Brake Rotor Diam x Thickness (in)14 x 1.6
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Fuel Tank Capacity, Approx (L)136
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Wheelbase (in)172
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Length, Overall (in)266.77
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Width, Max w/o mirrors (in)96.6
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Height, Overall (in)80.04
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Cab to Axle (in)55.24
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Ground Clearance, Front (in)10.39
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Ground Clearance, Rear (in)10.39
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Cargo Box Length @ Floor (in)98.22
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)50.55
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Cargo Box (Area) Height (in)21
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Cargo Volume (ft³)83.5
